Synchronizing arrangement



1945- e. WEGENER ETAL SYNCHRONIZING ARRANGEMENT Filed Oct. 10, 1941 .[n van for;

eusmr WEGZWEI? Ina/114 SCIIL'PPMA/VA/ Patented Feb. 13, 1945 I 2,369,625 SYNCHRONIZING ARRANGEMENT Gustav Wegener and Wilhelm Scheppmann, Berlin, Germany; Custodian vested in the Alien Property Application October 10, 1941, Serial No. 414,482 In Germany June 28, 1940 2 Claims.

This invention relates to a synchronizing arrangement for printing telegraph systems and the like and has for its object the provision of a simple circuit arrangement by which two rotary members may be kept in proper phase relationship.

The present invention is concerned with a novel arrangement for obtaining the correct phase position of two synchronously running shafts. In this arrangement, a phase signal is detected from an irregular series, of signals of the same kind by a contact arrangement comprising two, contacts mounted on the controlled shaft. In the event of phase coincidence of the shafts one of these contacts acts to test the commencement of the phase signal while the other contact is to test the end thereof. The transmission of the phase. signal also takes place when the sender is emitting irregular signals, such as telegraph signals, for instance. The phase signal even if transmitted together with other signals, as telegraph signals, insures that the controlled shaft of the receiver assumes the correct phase position, provided that the shaft of the sender and that of the receiver run synchronously with each other.

In the drawing, Fig. 1 is a circuit diagram showing one embodiment of the invention, Fig. 2 is a schematic detail view which illustrates in perspective a contact device of the arrangement represented in Fig. 1.

I denotes the control shaft of the sender. This shaft is arranged to be driven by a motor 3 through gearing 2. 1 denotes a motor of the receiver. In order to synchronize the motors 3, I with each other any well known speed regulating device may be employed, or the motors may be connected to an existing synchronizing network. Shaft I carries an impulsing device comprised of a contact disc 4 and brushes 5, 6.

The controlled shaft 9 of the receiver is connected with motor I through gearing 8. Shaft 9 carries a contact disc I provided with a circumferential contact members II shown apart in Fig. 2 the two contacts occupying an angular distance equal to that of the contact on the transmitting drum. Brushes I2, I3, Mare arranged to contact with the circumference of the disc Ill. Member II is so shaped that either the brushes I3, I2 or the brushes I3, I4 shall contact therewith. The-brushes I2, I4 are joined to storing devices I5 or I6, respectively, which can discharge across grid leak resistances I1, I8 of electron tubes R01, R02. Relays R1, R2 in the anode circuits of these tubes are arranged to control a relay Po that serves to initiate phase displacement of shaft 9.

When the shafts I, 9 are running synchronously the impulsing device 4, 5, 6 after each revolution of disc 4 emits an impulse or so-called phase signal to the contact device II), II, I2, I3, I4, If the shafts I, 9 are cophasal in position the phase signal is conveyed to the contact member II by brush I3. With the condition shown in the drawing part of this impulse is conveyed to the storing device I5 and is stored here. Device I5 at once discharges across resistance I1 and thereby varies the anode current of tube R01 in such a manner that relay R1 assumes the condition. represented in the drawing. The time constant of such discharge is so chosen that during one revolution of shaft 9 relay R1 remains in this condition so that relay P22 is not actuated. As a result, the phase position of shaft 9 is not varied. on further rotation of the disc Ill the brush I2 leaves the contact member II while brush I4 comes to contact therewith. Brush I I conveys part of the phase impulse to the storing device I6, which at once discharges across resistance I 8 and thereby varies the anode current of tube R02 in such a manner that relay R2 too assumes the condition represented in the drawing. Also in this case, therefore, relay P22 is not actuated, and shaft 9 hence not subjected to phase variation.

If the phase position of the shafts I, 9 is not correct then the phase impulse fails to reach the contact member II in the requisite manner. The storing devices I5, I6 hence will receive incomplete or no impulses, depending upon the phase difference between the shafts I, 9. In cases where no impulses can act on the storing devices I5, I6 the relays R1, R2 will switch their contacts and in this way actuate the phase-adjusting device by means of relay Pv until regular impulses are derived from the phase signal to act on I5, I 6. The correct phase position of the two shafts then has been established.

If shaft 9 is driven a trifle faster'than shaft I of the transmitter, the phase adjusting device will act, according to known practice, to retard shaft 9 until the phase adjusting device is disabled by a the operation of relays R1 and R2 to the positions shown in the drawing in which P22 is unoperated. In a different arrangement where the receiver shaft 9 is turning a trifle slower than the transmitter shaft, then the phase adjusting device must be of a kind to accelerate shaft 9 so long as relay P22 is operated.

. It will be understood that the lines connecting the transmitter and receiver are telegraph lines.

and that. these units are remote from each other.

As the phase signal is produced after each revolution of shaft I, thus being of periodic nature, this impulse will distinguish from impulses of irregular occurrence, as telegraph signals, for instance, and will hence be easy to detect; from a series of signal impulses.

What is claimed is:

1. A synchronizing arrangement for printing telegraph systems and the like comprising a telegraph circuit, a rotary transmitter shaft, a contact on said shaft for transmitting a synchronizing impulse once each revolution, a rotary receiver shaft moving at a. slightly diflerent rate from that of the transmitter shaft, a drum on said receiver shaft, a pair of contacts disposed on said drum angularly displaced from each other, a brush in said telegraph circuit adapted to engage said contacts in succession, a pair of vacuum tubes each having an anode circuit ineluding a relay and an input circuit including a grid, a grid leak and condenser, a brush in each grid circuit adapted to engage one of said confacts on said receiver drum, to charge the associated condenser and thereby cause said tube to hold the associated relay in operated condition for the duration of the condenser discharge, a third relay operable from either of said relays adapted to control a phase correcting device for said receiver shaft, said third relay being positioned so as to disconnect the phase correcting device when both of the first mentioned relays are operated by their vacuum tubes.

2. A synchronizing arrangement according to claim 1 in which the time constant of said condensers and grid leaks is such as to hold the associated relay operated for the duration of one revolution after a condenser has been charged.

GUSTAV WEGENER. WILHELM SCHEPPMANN. 

